London 2012 - Begin your journey here

Deloitte, business advisers working with the London Organising Committee of the Olympic and Paralympic Games (LOCOG), said businesses had also to consider how they would cope with the possibility of disruption to daily operations.

The survey suggested 39% of businesses in the sector had reviewed, or intended to review, their crisis response plans while 35% would re-evaluate their holiday policies.

Graham Pickett, Deloitte's travel, hospitality and tourism head, said: "It is a concern that over half of businesses in the sector have no plans to review their crisis response plans.

"With the right preparations made and plans in place to manage the influx of visitors into the capital and Games venues around the country, there's no reason why the sector cannot benefit from London 2012."

The survey results come as Transport for London warned businesses not to overlook the Paralympics in September 2012 when making their travel plans, with the Games coinciding with the start of the school year.